"The money could be used to assist with things like developing the roads, the bike paths, the recreation facilities," she told an audience at the Eidos Institute in Brisbane.

But Mr Abbott says the public should not expect the plan to work.

"Julia Gillard has a record with infrastructure, it's called the Building the Education Revolution program," he said.

Ms Gillard used a speech on Sunday to repeat the Government's intention of finalising its plan after receiving expert advice later this year.

The Opposition's immigration spokesman, Scott Morrison, says the public deserves more detail before the election.

"We have committed ourselves to be subject to a population growth cap," he said.

"That is a world of difference from a Government that is committed itself to absolutely nothing other than just more talk and no policy until after an election."

The campaigning Mr Abbott appeared relaxed in the home of Christian and Emily Knight as they served the would-be PM tea and scones in the western Sydney surburb of Cranebrook.

The topic of conversation centred on the family budget and the Knights' struggle with the rising cost of living.

Mr Abbott reiterated how a Coalition government would cut government spending by $47 billion.

He also took a shot at Ms Gillard's election catch phrase,"moving forward".

"I think by the time the public have heard this mindless mantra, hundreds if not thousands of times, they will come to the conclusion that the best way for our country to move forward is for Labor to move out," he said.